Causes of damage to ladle purging plug

 1. Thermal stress.

The refractory material of the ladle purging plug working surface is directly in contact with the high-temperature molten steel, and is also subjected to the continuous blowing of the cold air flow, which generates a large temperature gradient, resulting in a high concentration of stress.

2. Scour, and wear.
The blown gas gives a certain reverse impact force to the refractory material of the ladle permeable brick working surface and its surrounding area.

3. Chemical erosion and steel clamping.
The material of the ladle purging plug reacts with the molten steel penetrating into the slit and the slag that has entered the working layer, which changes the physical and chemical properties of the working layer of ladle purging plug and increases the tendency of peeling.

4.Oxygen cleaning.
In the actual application process, thermal stress is one of the most important reasons for the damage of ladle purging plug.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality ladle purging plug are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Causes of damage to ladle purging plug
Company name: Henan Changxing Refractory Materials Co.,Ltd
More refractory products:https://www.cxrefractories.com/en-product-solution
Email:info@cxrefractories.com
Website:https://www.cxrefractories.com

 

Four main reasons for damage to ladle purging plug

 There are four main reasons for the damage of ladle purging plug as follows:

1. The role of thermal stress

The refractory materials on the working surface of the purging plug, especially the refractory materials around the air outlet, are directly in contact with the high-temperature molten steel, and are affected by the high-temperature molten steel and the continuous outflow of cold airflow, resulting in a large temperature gradient. The rapid cooling and heating effect is great, especially the parts close to the air outlet are subjected to greater thermal stress, which is prone to cracks.

2. The effect of mechanical wear

During the tapping process, the high-speed and strong scouring of the molten steel against the bottom of the steel tank accelerates the corrosion of the ventilating brick; Some people have studied the damage of the ventilating brick through hydraulic model tests and found that: when a low-speed flow of air is injected into the liquid-phase molten pool. When the airflow hits back and hits the front of the ventilating brick, it gives a certain impact force to the refractory around the air port. When the gas flow rate is further increased, the reverse pulse frequency is reduced, but the reverse impact strength is further increased; In addition, when the argon is blown into the normal spray state, the strong bubbles form a gas jet, which strengthens the stirring at the bottom of the steel tank , The liquid phase movement at the bottom of the steel tank is intensified, and the two-phase plume causes the ventilating brick to be subjected to strong shear and impact stress. When the air-permeable brick is higher than the seat brick, the shear and erosion of this kind of plume are particularly obvious. The part higher than the seat brick is generally washed away after one use; In addition, if the valve is quickly closed after the refining is completed, the molten steel will be reversed. The impact will also accelerate the damage of the breathable brick.

3. Chemical attack

The working face of ventilated bricks has a long contact time with slag and molten steel, and the molten slag continuously infiltrates and penetrates into the bricks during the entire package service. The oxides MnO, MgO, SiO2, FeO, Fe2O3, etc. in the molten steel and slag react with the bricks, and the resulting FeO·Al2O3, 2(MnO)·SiO2·Al2O3, 12CaO·7Al2O3 and other low-melting substances are washed away, causing the ladle permeable brick to be washed away erosion.

4. The role of mechanical stress

The working surface of the refractory material at the bottom of the ladle is in direct contact with the high-temperature molten steel, and the temperature of the non-working surface of the refractory material at the bottom of the ladle is relatively low. The temperature of the ladle has been changing during the cycle of using molten steel → molten steel pouring → hot repair of the ladle → molten steel. , The volume of the bottom refractory material changes accordingly. Due to the existence of the temperature gradient of the bottom refractory material and the different expansion coefficients of the metamorphic layer of the bottom refractory material and the original layer, the corresponding volume of each layer of the bottom refractory material from the working surface to the non-working surface The changes are different, which generates shearing force on the ventilating bricks, causing the ventilating bricks to produce horizontal cracks, and even causing the ventilating bricks to appear horizontally fractured. During the baking process of the ladle integrally poured at the bottom of the ladle, the heating speed is too fast, and the temperature gradient of the refractory material at the bottom of the ladle is too large, and the same phenomenon will occur in the purging plug.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality changxing?refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Four main reasons for damage to ladle purging plug
Company name: Henan Changxing Refractory Materials Co.,Ltd

More refractory products: http://www.cxrefractories.com/en-product-solution
Email:?info@cxrefractories.com
Website:http://www.cxrefractories.com

The use and composition of ladle purging plug

 In modern steel smelting technology, ladle purging plug is a very important functional element in the out-of-furnace refining technology. Inert gases such as argon are introduced into the molten steel through the ladle purging plug at the bottom of the ladle to provide power for the stirring of the molten steel to achieve uniform steel. Aim to make the alloy composition and uniform temperature are average in the liquid steel. According to the assembly mode, the purging plug can be divided into integrated purging plug and seperated purging plug. Both are composed of purging plug core and well block. Whether integrated purging plug or seperated purging plug, the function of the well block is to protect the brick core and prevent molten steel from corroding to any position of the brick core except the working surface. Usually the bricks will be damaged as follows: Erosion of molten steel, spalling, transversely broken, longitudinally cracked of well block.

Ladle purging plug is a very important functional element in the out-of-furnace refining technology. Inert gases such as argon are introduced into the molten steel through the ladle purging plug at the bottom of the ladle to provide power for the stirring of the molten steel to achieve uniform steel.

Article Source: The use and composition of ladle purging plug
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com

Different types of purge plug for refining ladle

1.Disperse type. There have many refractory news and refractory products information on our factory. Such as Ladle Permeable Brick, fire bricks and other refractory products. You can read more refractory products and know more refractory materials information. It is composed of grains which are used for adjusting the purge plug, which makes it highly permeable. But the permeability can not be manually controlled, it is with low strength and service life.

2.Slit type. The air gap is formed by the septas between the micro dense sheets. Air is blown into refining ladle through these gaps. The adjustability of blowing capacity is better than disperse type but still not easy to control.

3.Aligned pore type. It is produced by putting different numbers of thin stainless steel pipes inside. The air volume and distribution can be manually controlled by this type of purge plug, it is also with higher service life.

4.Maze type. It is produced by putting a netted air supplying tunnel in the fine and closely woven base. Air volume can be easily controlled. Even if one pass is blocked by the penetrated molten steel, air still can go into the refining ladle through other passes.

5.Maze combined with aligned pore type. It combines the advantages of both aligned pore type and maze type, thus offers better performaces.

There have many kinds of refractory products in our factory. What's more, there have many kinds of refractory fire bricks and other refractory products in our factory. Welcome to view our factory anytime.
Article Source: Different types of purge plug for refining ladle
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/